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为探明羧甲基纤维素钠(CMC)与麦秸秆纤维对植被混凝土基材力学与植生性能的影响,通过直剪试验、植生试验研究了改性后植被混凝土基材(简称改性基材)的抗剪性能与黑麦草生长性能。结果表明:(1)改性基材的剪切强度随CMC掺量的增加呈先增后减的变化趋势,0.5%CMC掺量时基材的剪切强度出现峰值,而随纤维掺量的增加改性基材剪切强度呈近似线性增长的趋势,无明显峰值出现,说明添加纤维与CMC均能提升改性基材的延性;(2)改性基材的黏聚力随CMC掺量的增加呈近似线性增长的变化趋势,随纤维掺量的增加呈先增后减的变化趋势,当纤维掺量为1.0%左右时改性基材的黏聚力出现峰值;改性基材的内摩擦角随纤维掺量的增加呈先增后减的趋势,当纤维掺量为1.0%左右时改性基材的内摩擦角出现峰值,而随CMC掺量的增加改性基材的内摩擦角呈减少的趋势;(3)添加适量的纤维与CMC对黑麦草的萌发与生长有一定程度的促进作用,但当CMC掺量超过0.5%后,对黑麦草的生长表现为抑制作用。该研究结果可为植被护坡基材的改进提供参考。
Abstract：In order to explore the effects of Sodium Carboxymethyl Cellulose(CMC) and wheat straw fiber on the mechanics and plant growth performance of the vegetation concrete substrate, this paper studies the shear resistance and growth performance of ryegrass of the modified vegetation concrete substrate through the direct shear test and the plant growth experiment.The results are as follows:(1)The shear strength of the modified substrate increases first and then decreases with the increase of CMC content, and peaks at 0.5% CMC content, while the shear strength increases almost linearly with the increase of fiber content, with no obvious peak.The addition of fiber and CMC increases the ductility of the modified substrate.(2)The cohesion of the modified substrate increases almost linearly with the increase of CMC content, which increases first and then decreases with the increase of fiber content, and the fiber content peaks at about 1.0%;the internal friction angle of the modified substrate increases first and then decreases with the increase of fiber content, and peaks at about 1.0% fiber content, and decreases with the increase of CMC content.(3)Adding appropriate amount of fiber and CMC has a certain degree of promoting effect on the germination and growth of ryegrass, but when the amount of CMC exceeds 0.5%,the growth of ryegrass is inhibited.The study results can provide reference for the improvement of the base material of vegetation slope protection.
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基本信息:
DOI：10.13578/j.cnki.issn.1671-1556.20210142
中图分类号:TU528
引用信息:
[1]杨钊,王晓梅,周云艳.改性植被混凝土基材力学与植生试验研究[J].安全与环境工程,2022,29(01):225-233.DOI:10.13578/j.cnki.issn.1671-1556.20210142.
基金信息:
国家自然科学基金项目(41102228);国家自然科学基金面上项目(51379194)
2022-01-27
2022-01-27